Feature 16 PCS SET: The set contains 6 pcs string locking nuts, which are suitable for electric headless bass guitar, can tightly lock the strings. 2ZINC ALLOY MATERIAL: The guitar string locking nuts are made from excellent zinc alloy material, which are sturdy and firm. 3CORROSION RESISTANCE: The metal strong locking nuts are corrosion resistance, ensuring lasting durability. 4EASY INSTALLATION: The headless guitar string lock comes with a wrench and 6 mounting screws, very easy to install. 5IDEAL SUBSTITUTE: This professional headless guitar string locking nut set is ideal for replacing old broken or damaged parts.Item Type: Guitar String Locking NutMaterial: MetalSize: Approx. 1.65cm/0.65inColor: Black .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List6 x String Nuts1 x Wrench6 x Mounting Screw